error: unreachable statement
  --> $DIR/issue-7246.rs:17:5
   |
LL |     if *ptr::null() {}; //~ ERROR unreachable
   |     ^^^^^^^^^^^^^^^^^^^
   |
note: lint level defined here
  --> $DIR/issue-7246.rs:11:9
   |
LL | #![deny(unreachable_code)]
   |         ^^^^^^^^^^^^^^^^

error: aborting due to previous error